Question 1 :
A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give name for (a)?

Question 2 :
State true or false: Sanitation and disease are related to each other as lack of sanitation can cause diseases.

Question 5 :
Animal waste, oil and urea are some of the organic impurities present in sewage. Name one more organic impurity present in sewage.

Question 7 :
State true or false: Sewage is the wastewater containing both liquid and solid wastes produced by human activities from homes, indusuries, hospitals, offices, etc.

Question 10 :
A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give name for (x)?

Question 14 :
The settled solids that are removed in wastewater treatment with a scraper. Which of the following term define the statement?

Question 17 :
Which of the folowing is related to inorganic impurities in reference to sewage?

Question 18 :
A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give name for (b)?

Question 19 :
Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

Question 21 :
Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence. (a) Sludge is scraped out and skimmer removes the floating grease. (b) Water is made to settle in a large tank with a slope in the middle. (c) Large objects like plastic bags are removed by passing wastewater through bar screens. (d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater. (e) Wastewater enters a grit and sand removal tank.

Question 23 :
Which of the following is used to remove large solid objects from wastewater?

Question 24 :
Which of the folowing is related to nutrients in reference to sewage?

Question 25 :
State true or false: Bacteria are the micro-organisms which causes cholera.

Question 26 :
Why should we not throw used tea leaves into the sink?

Question 29 :
Sewage is a solid waste which causes water pollution and soil pollution. TRUE or FALSE?

Question 31 :
Which of the folowing is related to organic impurities in reference to sewage?

Question 32 :
Which of the folowing is related to nutrients in reference to sewage?

Question 34 :
State true or false: Sludge is decomposed by anaerobic bacteria to produce biogas.

Question 35 :
Where underground sewerage systems and refuse disposal systems are not available, the high cost on-site sanitation system can be adopted. TRUE or FALSE?

Question 36 :
Water from kitchen used for washing dishes. Which of the following term define the statement?

Question 37 :
State true or false: Untreated human excreta causes pollution of soil and water including the underground water.

Question 38 :
Where underground sewerage systems and refuse disposal systems are not available, the high cost on-site sanitation system can be adopted. TRUE or FALSE?

Question 40 :
Semi-solids such as faeces that settle down during wastewater treatment are called as